Metal-boring tool



No. 748,890. PAIE NTBD n.5, 1904.; r. W. TAYLOR & s. NEWBOLD.

METAL BORING TOOL.

APPLICATION FILED NOV. 26, 1902. R0 IODBL. 2 SHEETS-SHEETI.

. Ho. v43,s90. v PATENTED JANQ5, 1904.

11. w. TAYLOR & s. NEWBOLD.

METAL BORING TOOL.

I APPLIGATIOR nun) NOV. 25, 1902. N0 MODEL. 2 SHEETS-SHEET 2.

UNITED STATES Patented January 5, 1904.

PATENT OFFICE.

FREDERICK W. TAYLOR, OF PHILADELPHIA, PENNSYLVANIA, AND

SIDNEY NEWBOLD, OF JOBSTOWN, NEW JERSEY.

METAL-BORING TOOL.

SPECIFICATION forming part of Letters Batent No. 748,890, dated January 5, 1904.

Application filed November 25, 1902. Serial No. 132,753. (No model.)

To all whom it may c0nccrn:

Be it known that we, FREDERICK W. TAY- LOR, a resident of Philadelphia, in the county of Philadelphia, in the State of Pennsylvania, and SIDNEY NEWBOLD, a resident of Jobstown, in the county of Burlington, in the State of New Jersey, both citizens of the United States of America, haveinvented certain new and useful Improvements in Metal- Boring Tools, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof. v

Our invention relates to tools or devices for boring metalssuch as drills, reamers, countersinking devices, &C.l3l16 object of our invention being to'provide a tool for such purposes which is both of greater efficiency and of less cost than the tools heretofore generally used and our invention being in one phase an outgrowth and involving'the principle of our former invention in metal-cutting tools described and claimed in our Patent No. 709,526, dated the 23d'of September, 1902, said patented invention relating to the device for securing metal-cutting tools, preferably of self-hardening steel, in holders by means of a packing of fusible metal.

As heretofore practiced by us and explained in our before-mentioned patent, the metalcutting tools inserted in the cavities formed in the proper holders and secured therein, as described, were exposed to a certain class of strains-such as exist'in lathes, planers, saws, milling-machines, and the like--such strains being quite different from those which exist in tools used for boring through metal; and our present invention consists, broadly speaking, in the combination of a cutter-holder adapted to be secured to a boring-machine and having in its end transversely-extending grooves or cavities which extendon both sides of the center line about which the holder turns, said holder cavity or cavities having their walls toward which the cutting-tools are pressed in the operation of cutting adapted to receive and form an abutment for said tools, with a cutter or cutters inserted in the cavity or cavities and having their inserted portions lying in contact with the walls of the cavity against which they are pressed in operation, and a packing of fusible metal filling the spaces between the inserted portion of the tool or tools and the Walls of the cavity or cavities. By preference the tools or cutters so combined with holders are made of self-hardening steel, and the compound tool is thus adapted formore rapid and eifective work than if the cutting portions thereof are of ordinary tempered tool-steel, while the ex pense ofthe construction is materially lessened, as the holdercan be made of materials and by means which involve little expense, while practically no work is done upon the cutters themselves except providing them with the propercutting edges.

Where our invention is applied to the construction of tools for reaming out perforations already-formed or for countersinking ably of self-hardening steel can be secured in the holder, as will be hereinafter more fully explained; but where the tool is intended for use as a drill we have found it advisable to use self-hardening tool-steel to form lateral cutters for the drill and a central cutter of tempered steel, which is better adapted to withstand the pressure and twisting strain to which the central portion of the drill is exposed than are the self-hardening tool-steels, while the desired object is attained by the combination with said central cutter of the lateral cutters of self-hardening steel, enabling the hole to be bored with a speed which would be impracticable if they were made of tempered tool-steel.

The detail features of our invention will be best understood as described in connection with the drawings, in which Figure 1 is a side elevation of a tool constructed, in accordance with our invention, Fig. 2 being a cross-section on the line 2 2 of Fig. '1; Fig. 3, a side view of the cutting portion of the drill, taken at right angles to that shown in Fig. 1; Fig. 4, a central section through the holder, taken as on the line 4 4 of Fig. 2. Fig. 5 is a perspective view of the cutting-tools used in connection with the drill; Fig. 6, a side elevation of a drillingtool constructed in accordance with our invention. Fig. 7 is a cross-section on the line 7 7 of Fig. 6. Fig. 8 is an end view of the countersinking-tool shown in Fig. 9. Fig. 9 is a side elevation of a countersinking-tool constructed in accordance with our invention.

A A in Figs. 1, 6, and 9 indicate the portion of the tool which is adapted to be secured in the holding appliances of a boring- .nachine, A A indicating the body of the holder, which is generally made, as shown, of cylindrical form; A A Figs. 1 and 6, indicating spiral chip-grooves formed on the walls of the holder; a a Figs. 1, 2, and 3, indicati ng approximately longitudinal extensions of these chip-grooves at the end of the holder, formed, as shown, for the purpose of strengthening the wall of the cavity in which the cutting-tools are to be inserted.

A indicates a transverse groove formed across the end of the holder, which is of conical outline at this point, as indicated at a. As shown, the transverse groove A is deeper at the center, as indicated at A and has at its ends supporting-surfaces (indicated at a. (1 upon which the lateral cutters of the drill rest. I

A indicates another transversely-extend ing groove or cavity intersecting the groove A and by preference not extending through the walls of the conical portion of the holder, as is well shown in the drawings.

A A", &c., indicate the walls of the grooves or cavities toward or against which the inserted cutting portion of the tool is pressed in the operation of boring.

a a, 850., indicate the opposite walls away from which the cutting portion of the tool is pressed in working and which walls by preference are so formed as to afiord a considerable space between them and the adjacent inserted portion of the tool.

B B are separate lateral cutting portions of the tool, made of self-hardening steel, which are inserted in the groove or cavity A but which do not extend to the center. By preference these lateral cutting portions B B are formed with shoulders B, which rest upon the supports a and with downward and inward extensions (indicated at B B which lap over each other at the center of the holder at the depressed portion A of the cavity and the upper surfaces 1) b of which are adapted to serve as a support for the central cuttingtool, which central tool is indicated at C, being preferably formed with one or more lateral grooves C on each side, 0 indicating the cutting edges and O the bottom, which rests upon the lapped extensions B The tool is assembled by inserting the lateral cutters B B in the groove A with their inserted portions in contact with the walls A A of the holder, toward which walls the tools are pressed in the act of cutting. The central cutter C, which is by preference made of tempered tool-steel, is then inserted in the cavity or groove A so that its base 0 will rest upon the inward extension B of the lateralcutters and with its inserted portions brought into abutting contact with the walls A A of the groove A toward which walls the tool is pressed in operation. A packing of fusible metal, as described in our former patent, is then run into the spaces left between the inserted portions of the tools and the walls of the cavities, filling such portions and also of course the spaces intervening between the inserted tools and solidifying, so as to combine the parts together in a manner which we have found to be thoroughly efficient for boring purposes. This special form of tool embodying the tempered tool-steel has a central cutter, and the air-hardening tool-steel as lateral cutters being adapted for more rapid and efficient operation than has heretofore been practicable, and obviously the cuttingtools of the drill can be readily replaced whenever broken or so worn as to require replacement.

In case of a drill or countersinking-reamer, such as are shown in Figs. 6 and 7, a single transversely-extending cavity (indicated at A is formed in the end of the holder, and a drilling or reaming tool (indicated at E and F, respectively, and formed, preferably, of self-hardening steel) is provided wit-h a shank or insertible portion E or F, which is inserted in the cavity A and abutted against the walls A A of such cavity toward which the tool is pressed in operation. The spaces between the inserted ends of the tool and the walls of the cavity are then filled with fusible metal, as indicated at D, and the tool is ready for use. The cutting portion of the, tool in this instance is formed of a single piece E or F; but in the form shown in Figs. 1 to 5 the corresponding portion of the tool is formed of two pieces B B.

Referring again to the drilling-tool shown in Figs. 1 to 5, inclusive, we would say that, apart from the method of assembling the parts which we have described and which we believe to be the best for its manufacture, the tool having in combination with a holder a central cutting-tool of tempered steel and of less breadth than the hole to be drilled and lateral cutting-tools of self-hardening steel which do not extend to the center of the drill is new with us and is intended to be covered broadly.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. A device for boring metal, consisting of a tool-holder adapted to be secured to a boring-machine, and having a cavity at its outer end to receive the cutting portion of the tool, said cavity extending on both sides of the center of the holder and being formed with walls A, A forming abutments for said cutting portion, in combination with a tool having its cutting portion loosely inserted in the holder-cavity and abutting against the walls A, A, and a packing of fusible metal filling the spaces between the inserted cutting portion of the tool and the Walls of the cavity.

2. A device for boring metal, consisting of a tool-holder adapted to be secured to a boring-machine and having a cylindrical body formed with spiral chip-grooves merging into approximately straight longitudinal grooves at the outer end of the cylindrical body, said holder having a transversely-extending cavity, formed, in its end and lying between the ends of the longitudinal chip-grooves, to receive the end or shank of a metal-cutting tool, in combination with a cutting-tool having its end or shank inserted in the holdercavity and having its face abetted against the wall or walls of the cavity which receive the main thrust in working, and a packing of fusible metal filling the space between the tool shank or shanks and the walls of the holder-cavity.

3. Adevice for boring metal, consisting of a holder adapted to be secured to a boring-ma chine and having its outer end formed with two transversely extending and intersecting cavities, in combination with lateral cuttingtools inserted in one such cavity but not extending to the center of the holder, a central cutting-tool inserted in the other said cavity, and a packing of fusible metal filling the spaces between the tools and the holder-cavities and between the tools in said cavities.

4. A device forboring metal, consisting ofa holder having at its end a transversely ex tending groove A and a second transverselyextending groove A intersecting the groove A in combination with lateral cutters B, B, secured in the groove A a central cutter C, secured in the groove A said cutters having their inserted ends abutted against the walls A of the groove-cavities, and a packing of fusible metal filling the spaces between the groove-cavities and the inserted portions of the tools.

5. A device for boring metal, consistingof a holder having at its end a transversely-extending groove A and a second transverselyextending groove A intersecting the groove A in'combination with lateral cutters B, B, of self-hardening steel, secured in the groove A a central cutter O, of tempered steel, secured in the groove A said cutters having their inserted ends abutted against the walls A, of the groove-cavities, and a packing of fusible metal filling the spaces between the groove-cavities and the inserted portions of the tools.

6. r A device for boring metal, consisting of a holder adapted to be secured to a boring-machine and having a central drill of tempered steel secured to it, and cavities or recesses adapted to receive lateral cutting tools formed in its end, in combination, with lateral cutting-tools formed of self-hardening tool-steel, having their ends inserted in said cavities and abutted against the walls thereof toward which they are pressed when in operation, and a packing or filling of fusible metal filling the spaces between the walls of the cavity and the inserted portions of the lateral cutting-tools.

7. A device for boring metal, consisting of a tool-holder having projecting from its end a central boring-tool narrower than the hole to be bored and made of tempered tool-steel, and lateral cutters of self-hardening tool-steel, extending beyond the ends of the central cutter but not to the center of the holder.

FRED. W. TAYLOR. SIDNEY NEWBOLD.

Witnesses as to signature of F. W. Taylor:

JOSEPH F. ONEILL, D. STEWART. WVitnesses as to signature of Sidney New bold:

MARGARET W. ALEXANDER, RONZO H. CLARK. 

